<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>有些标签没有同源的限制</title>
    <script src="http://localhost:4000/getAjax?user=wang&text=nihao"></script>
  </head>
  <body>
    <!-- <img src="" alt="">
    <iframe src="" frameborder="0"></iframe>
    <script></script> -->
  </body>
  <script>
    // 有些标签没有同源的限制,所以就没有跨域的问题
  </script>
</html>
